Flat iron



FIG. 1 is a perspective view of a flat iron showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is another perspective view thereof with the flat iron in an open position;

FIG. 9 is a perspective view of a second embodiment of the flat iron showing my new design;

FIG. 10 is a left side elevational view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a right side elevational view thereof;

FIG. 13 is a bottom plan view thereof;

FIG. 14 is a front elevational view thereof;

FIG. 15 is a rear elevational view thereof; and,

FIG. 16 is another perspective view thereof with the flat iron in an open position.

The broken lines in the drawings illustrate portions of the flat iron, which form no part of the claimed design. 

CLAIM The ornamental design for a flat iron, as shown and described. 